Version 3

Version 3 of the calculator (the current version) was published in March 2008.

We plan to coninue it for the forseeable future.

The main changes from version 2 were: • electricity: the CO2 emission factor was changed to 0.527 kg / kWh (from 0.43 kg / kWh) to allow for grid losses • the reduction for renewable sources of electricity was changed from a 90% reduction to a 25% reduction and restricted to certain tariffs • natural gas: the CO2 factor was changed from 0.19 kg / kWh to 0.203 (to allow for supply inefficiencies) • addition of heating oil • the factor for cars was changed from 10.5 to 14.3 kg CO2 per gallon (to allow for oil extraction, refinery inefficiency, and motor vehicle manufacture) • the basic total for food was increased from 1.4 to 2.2 tonnes CO2 equ. per person, to incorporate information on methane and nitrous oxide emissions in sources [10] and [12].